{
  "manageEntity": {
    "action": "Save",
    "entityId": "757102",
    "entityType": "Track",
    "nonce": "0x60f4028786a80a862ba64adb4fb93a89469c256535ef063331a6c07d64b1231f",
    "signature": "0xf51716799710311e8c7150b47350e3f332f0206ae13b677e8384a3f6a02e48d63d9b844b3aaa51a06abc98ea895d8b9e54d7a76248051609d6d63fbbe7b9dd3a1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}